Pilot Study on the Treatment of Rural Domestic Wastewater with Low C/N Ratio Using the AO-MABR Process
To address the poor removal efficiencies of chemical oxygen demand (COD), ammonia nitrogen, and total nitrogen (TN) by existing treatment processes for rural domestic wastewater with low carbon-to-nitrogen (C/N) ratios, an integrated AO-MABR process was developed and evaluated in a field pilot-scale study. The results demonstrated that the optimal operational parameters of the process were as follows: hydraulic retention time (HRT) of 3.0 h, membrane aeration pressure of 20 kPa, and internal reflux ratio of 200%. Under these optimal conditions, when the influent C/N ratio ranged from 3 to 4, the average removal efficiencies of COD, ammonia nitrogen, and TN by the AO-MABR system reached 91.28%, 86.52%, and 86.67%, respectively, with corresponding effluent concentrations of 26.87 mg/L, 2.65 mg/L, and 4.98 mg/L. The integrated AO-MABR process exhibited superior pollutant removal performance compared with conventional treatment technologies.
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